
#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<stdlib.h>



#define LINE_SIZE 1024
#define FLUSH_NOW 1
#define FLUSH_LINE 2
#define FLUSH_FULL 4



typedef struct _myFILE
{
  unsigned int flags;
  int fileno;

  //缓冲区
  char cache[LINE_SIZE];
  int cap;
  int pos;//下一次插入数据的位置
  
}myFILE; 
myFILE* my_fopen(const char *path, const char *flag);
void my_fflush(myFILE *fp);
ssize_t my_fwrite(myFILE *fp, const char *data, int len);
void my_fclose(myFILE *fp);
